Heterocyclic compound and organic light-emitting device including the same

ABSTRACT

A heterocyclic compound of formula 1 and an organic light-emitting device including an organic layer containing the heterocyclic compound. The heterocyclic compound of Formula 1 may be suitable as a material for an emission layer, an electron transport layer or an electron injection layer of an organic light-emitting device. Due to the inclusion of the heterocylic group in its molecular structure, the heterocyclic compound of Formula 1 may have a high glass transition temperature (Tg) or a high melting point, and may prevent crystallization. An organic light-emitting device manufactured using the heterocyclic compound of Formula 1, which has a symmetrical structure in which a chrysene group and an indole group are fused, has excellent durability when stored or operated.

CLAIM OF PRIORITY

This application claims the benefit of Korean Patent Application No. 10-2010-0031554, filed on Apr. 6, 2010, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a heterocyclic compound and an organic light-emitting device including the heterocyclic compound.

2. Description of the Related Art

Organic light-emitting devices are self-emitting display devices and have a wide viewing angle, a high contrast ratio, and a short response time. Due to these characteristics, organic light-emitting devices are drawing more attention.

Typically, an organic light-emitting device has a stack structure including an anode, a cathode and an organic emission layer interposed therebetween. However, a hole injection layer and/or a hole transport layer may be further stacked between the anode and the organic emission layer, and an electron transport layer may be further stacked between the organic emission layer and the cathode. In other words, an organic light-emitting device may have a stack structure of anode/hole transport layer/organic emission layer/cathode or a stack structure of anode/hole transport layer/organic emission layer/electron transport layer/cathode.

As a material for the organic emission layer, an anthracene derivative can be used. However, organic light-emitting devices including such a known organic emission material do not have satisfactory life span, efficiency, and power consumption characteristics, still leaving a demand for further improvement.

SUMMARY OF THE INVENTION

The present invention provides a heterocyclic compound having improved electrical characteristics, charge transporting capability and light-emission capability.

The present invention provides an organic light-emitting device including a heterocyclic compound.

According to an aspect of the present invention, there is provided a heterocyclic compound represented by Formula 1 below:

In Formula 1, R₁ through R₁₄ are each independently selected from the group consisting of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, an amino group, a nitro group, a hydroxyl group, a carboxyl group, a substituted or unsubstituted C₁-C₅₀ alkyl group, a substituted or unsubstituted C₂-C₅₀ alkenyl group, a substituted or unsubstituted C₂-C₅₀ alkynyl group, a substituted or unsubstituted C₃-C₅₀ cycloalkyl group, a substituted or unsubstituted C₁-C₅₀ alkoxy group, a group represented by —(Ar₁)_(a)—(Ar₁₁), and a group represented by —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)], wherein at least two adjacent groups of R₁ through R₁₄ are linked to form a saturated or unsaturated ring;

Ar₁ through Ar₄ are each independently selected from the group consisting of a substituted or unsubstituted C₁-C₅₀ alkylene group, a substituted or unsubstituted C₂-C₅₀ alkenylene group, a substituted or unsubstituted C₅-C₆₀ arylene group, and a substituted or unsubstituted C₄-C₆₀ heteroarylene group;

Ar₁₁, Ar₁₂ and Ar₁₃ are each independently selected from the group consisting of a substituted or unsubstituted C₅-C₆₀ aryl group, a substituted or unsubstituted C₅-C₅₀ aryloxy group, a substituted or unsubstituted C₅-C₅₀ arylthio group, and a substituted or unsubstituted C₄-C₆₀ heteroaryl group;

a, b, c and d are each independently an integer from 0 to 10; and

“a” groups of —Ar₁— in —(Ar₁)_(a)—(Ar₁₁) are identical to or different from each other, “b” groups of —Ar₂— in —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)] are identical to or different from each other, “c” groups of —Ar₃— are identical to or different from each other, and “d” groups of —Ar₄— are identical to or different from each other.

The heterocyclic compound may be represented by Formula 2 below:

In Formula 2, R₁, R₂, R₃, R₈, R₉ and R₁₀ are each independently selected from the group consisting of a substituted or unsubstituted C₁-C₅₀ alkyl group, a substituted or unsubstituted C₂-C₅₀ alkenyl group, a substituted or unsubstituted C₂-C₅₀ alkynyl group, a substituted or unsubstituted C₃-C₅₀ cycloalkyl group, a substituted or unsubstituted C₁-C₅₀ alkoxy group, a group represented by —(Ar₁)_(a)—(Ar₁₁), and a group represented by —(Ar₂)_(b)—N[—(Ar₃)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)], wherein at least two adjacent groups of R₁, R₂, R₃, R₈, R₉ and R₁₀ are linked to form a saturated or unsaturated ring; and Ar₁, Ar₂, Ar₃, Ar₄, Ar₁₁, Ar₁₂, Ar₁₃, a, b, c and d are defined as described above in conjunction with Formula 1.

According to another aspect of the present invention, there is provided an organic light-emitting device including: a first electrode; a second electrode disposed opposite to the first electrode; and an organic layer disposed between the first electrode and the second electrode, the organic layer containing the heterocyclic compound described above.

BRIEF DESCRIPTION OF THE DRAWING

A more complete appreciation of the invention, and many of the attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference symbols indicate the same or similar components, wherein:

FIG. 1 illustrates the structure of an organic light-emitting device according to an embodiment of the present invention.

FIG. 2 illustrates a process for making an organic light-emitting device of the invention.

DETAILED DESCRIPTION OF THE INVENTION

A heterocyclic compound according to an embodiment of the present invention is represented by Formula 1 below:

In Formula 1 above, R₁ through R₁₄ are each independently selected from the group consisting of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, an amino group, a nitro group, a hydroxyl group, a carboxyl group, a substituted or unsubstituted C₁-C₅₀ alkyl group, a substituted or unsubstituted C₂-C₅₀ alkenyl group, a substituted or unsubstituted C₂-C₅₀ alkynyl group, a substituted or unsubstituted C₃-C₅₀ cycloalkyl group, a substituted or unsubstituted C₁-C₅₀ alkoxy group, a group represented by —(Ar₁)_(a)—(Ar₁₁), and a group represented by —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)], wherein at least two adjacent groups of R₁ through R₁₄ may be linked to form a saturated or unsaturated ring.

Ar₁ through Ar₄ may be each independently selected from the group consisting of a substituted or unsubstituted C₁-C₅₀ alkylene group, a substituted or unsubstituted C₂-C₅₀ alkenylene group, a substituted or unsubstituted C₅-C₆₀ arylene group, and a substituted or unsubstituted C₄-C₆₀ heteroarylene group.

Examples of the substituted or unsubstituted C₅-C₂₀ arylene group and the substituted or unsubstituted C₄-C₂₀ heteroarylene group include, but are not limited to, a phenylene group, a C₁-C₁₀ alkylphenylene group, a C₁-C₁₀ alkoxyphenylene group, a halophenylene group, a cyanophenylene group, a dicyanophenylene group, a trifluoromethoxyphenylene group, an o-, m-, or p-tolylene group, an o-, m- or p-cumenylene group, a mesitylene group, a phenoxyphenylene group, a (α,α-dimethylbenzene)phenylene group, a (C₁-C₁₀alkylcyclohexyl)phenylene group, a (anthracenyl)phenylene group, a biphenylene group, a C₁-C₁₀ alkylbiphenylene group, a C₁-C₁₀ alkoxybiphenylene group, a pentalenyl group, an indenylene group, a naphthylene group, a C₁-C₁₀ alkylnaphthylene group, a C₁-C₁₀ alkoxynaphthylene group, a halonaphthylene group, a cyanonaphthylene group, a biphenyllenylene group, a C₁-C₁₀ alkyl biphenyllenylene group, a C₁-C₁₀ alkoxy biphenyllenylene group, a biphenylanthracenylene group, an anthracenylene group, an azulenylene group, a heptalenylene group, an acenaphthyllenylene group, a phenalenylene group, a fluorenylene group, an anthraquinolylene group, a methylanthrylene group, a phenanthrenylene group, a triphenyllenylene group, a pyrenylene group, a chrycenylene group, an ethyl-chrycenylene group, a picenylene group, a perylenylene group, a chloroperylenylene group, a pentaphenylene group, a pentacenylene group, a tetraphenyllenylene group, a hexaphenylene group, a hexacenylene group, a rubicenylene group, a coronenylene group, a trinaphthyllenylene group, a heptaphenylene group, a heptacenylene group, a pyranthrenylene group, an ovalenylene group, a carbazolylene group, a C₁-C₁₀ alkyl carbazolylene group, a thiophenylene group, an indolylene group, a purinylene group, a benzimidazolylene group, a quinolinylene group, a benzothiophenylene group, a parathiazinylene group, a pyrrolylene group, a pyrazolylene group, an imidazolylene group, an imidazolinylene group, an oxazolylene group, a thiazolylene group, a triazolylene group, a tetrazolylene group, an oxadiazolyl group, a pyridinylene group, a pyridazinylene group, a pyrimidinylene group, a pyrazinylene group, a thianthrenylene group, a pyrrolidinylene group, a pyrazolidinylene group, an imidazolidinylene group, a piperidinylene group, a piperazinylene group, and a morpholinylene group.

For example, Ar₁ through Ar₄ may be each independently selected from the group consisting of a phenylene group, a C₁-C₁₀ alkyl phenylene group, a di(C₁-C₁₀ alkyl)phenylene group, a naphthylene group, a C₁-C₁₀ alkyl naphthylene group, a di(C₁-C₁₀ alkyl)naphthylene group, an anthrylene group, a C₁-C₁₀ alkyl anthrylene group, a di(C₁-C₁₀ alkyl)anthrylene group, a fluorenylene group, a C₁-C₁₀ alkyl fluorenylene group, a di(C₁-C₁₀ alkyl)fluorenylene group, a C₆-C₁₄ aryl fluorenylene group, a di(C₆-C₁₄ aryl)fluorenylene group, a pyridylene group, a C₁-C₁₀ alkyl pyridylene group, a di(C₁-C₁₀ alkyl)pyridylene group, a carbazolylene group, a C₁-C₁₀ alkyl carbazolylene group, and a di(C₁-C₁₀ alkyl)carbazolylene group.

For example, Ar₁ through Ar₄ may be each independently selected from the group consisting of compounds represented by Formulae 2A through 2G below, but are not limited thereto:

In the formulae above, Z₁, Z₂, Z₁₁ and Z₁₂ are each independently selected from the group consisting of a hydrogen atom, a deuterium atom, a C₁-C₁₀ alkyl group (for example, methyl, ethyl, propyl, isobutyl, sec-butyl or the like), a C₁-C₁₀ alkoxy group (for example, methoxy, ethoxy, propoxy, isopropyloxy, butoxy or the like), and a C₆-C₁₄ aryl group (for example, phenyl, naphthyl or the like); p is an integer from 1 to 8; * denotes a binding site with Ar₁₁, Ar₁₂ or Ar₁₃; and *′ denotes a binding site with a ring of the backbone of Formula 1.

Ar₁₁, Ar₁₂ and Ar₁₃ are each independently selected from the group consisting of a substituted or unsubstituted C₅-C₆₀ aryl group, a substituted or unsubstituted C₅-C₅₀ aryloxy group, a substituted or unsubstituted C₅-C₅₀ arylthio group, and a substituted or unsubstituted C₄-C₆₀ heteroaryl group.

Ar₁₁, Ar₁₂ and Ar₁₃ may be each independently selected from the group consisting of a substituted or unsubstituted C₅-C₂₀ aryl group and a substituted or unsubstituted C₄-C₂₀ heteroaryl group.

Examples of the substituted or unsubstituted C₅-C₂₀ arylene group and the substituted or unsubstituted C₄-C₂₀ heteroarylene group include, but are not limited to, a phenylene group, a C₁-C₁₀ alkylphenylene group, a C₁-C₁₀ alkoxyphenylene group, a halophenylene group, a cyanophenylene group, a dicyanophenylene group, a trifluoromethoxyphenylene group, an o-, m-, or p-tolylene group, an o-, m- or p-cumenylene group, a mesitylene group, a phenoxyphenylene group, a (α,α-dimethylbenzene)phenylene group, a (C₁-C₁₀alkylcyclohexyl)phenylene group, a (anthracenyl)phenylene group, a biphenylene group, a C₁-C₁₀ alkylbiphenylene group, a C₁-C₁₀ alkoxybiphenylene group, a pentalenyl group, an indenylene group, a naphthylene group, a C₁-C₁₀ alkylnaphthylene group, a C₁-C₁₀ alkoxynaphthylene group, a halonaphthylene group, a cyanonaphthylene group, a biphenyllenylene group, a C₁-C₁₀ alkyl biphenyllenylene group, a C₁-C₁₀ alkoxy biphenyllenylene group, a biphenylanthracenylene group, an anthracenylene group, an azulenylene group, a heptalenylene group, an acenaphthyllenylene group, a phenalenylene group, a fluorenylene group, an anthraquinolylene group, a methylanthrylene group, a phenanthrenylene group, a triphenyllenylene group, a pyrenylene group, a chrycenylene group, an ethyl-chrycenylene group, a picenylene group, a perylenylene group, a chloroperylenylene group, a pentaphenylene group, a pentacenylene group, a tetraphenyllenylene group, a hexaphenylene group, a hexacenylene group, a rubicenylene group, a coronenylene group, a trinaphthyllenylene group, a heptaphenylene group, a heptacenylene group, a pyranthrenylene group, an ovalenylene group, a carbazolylene group, a C₁₋₁₀ alkyl carbazolylene group, a thiophenylene group, an indolylene group, a purinylene group, a benzimidazolylene group, a quinolinylene group, a benzothiophenylene group, a parathiazinylene group, a pyrrolylene group, a pyrazolylene group, an imidazolylene group, an imidazolinylene group, an oxazolylene group, a thiazolylene group, a triazolylene group, a tetrazolylene group, an oxadiazolyl group, a pyridinylene group, a pyridazinylene group, a pyrimidinylene group, a pyrazinylene group, a thianthrenylene group, a pyrrolidinylene group, a pyrazolidinylene group, an imidazolidinylene group, a piperidinylene group, a piperazinylene group, and a morpholinylene group.

For example, Ar₁₁, Ar₁₂ and Ar₁₃ may be each independently selected from the group consisting of a phenyl group, a C₁-C₁₀ alkyl phenyl group, a di(C₁-C₁₀ alkyl)phenyl group, a C₆-C₁₄ aryl phenyl group, a di(C₆-C₁₄ aryl)phenyl group, a naphthyl group, a C₁-C₁₀ alkyl naphthyl group, a di(C₁-C₁₀ alkyl)naphthyl group, a C₆-C₁₄ aryl naphthyl group, a di(C₆-C₁₄ aryl)naphthyl group, an anthryl group, a C₁-C₁₀ alkyl anthryl group, a di(C₁-C₁₀ alkyl)anthryl group, a C₆-C₁₄ aryl anthryl group, a di(C₆-C₁₄ aryl)anthryl group, a phenanthryl group, a C₁-C₁₀ alkyl phenanthryl group, a di(C₁-C₁₀ alkyl)phenanthryl group, a C₁-C₁₄ aryl phenanthryl group, a di(C₆-C₁₄ aryl)phenanthryl group, a fluorenyl group, a C₁-C₁₀ alkyl fluorenyl group, a di(C₁-C₁₀ alkyl)fluorenyl group, a C₆-C₁₄ aryl fluorenyl group, a di(C₆-C₁₄ aryl)fluorenyl group, a pyridyl group, a C₁-C₁₀ alkyl pyridyl group, a di(C₁-C₁₀ alkyl)pyridyl group, a pyrenyl group, a C₁-C₁₀ alkyl pyrenyl group, a di(C₁-C₁₀ alkyl)pyrenyl group, a C₆-C₁₄ aryl pyrenyl group, a di(C₆-C₁₄ aryl)pyrenyl group, a phenanthrolinyl group, a C₁-C₁₀ alkyl phenanthrolinyl group, a di(C₁-C₁₀ alkyl)phenanthrolinyl group, a C₆-C₁₄ aryl phenanthrolinyl group, a di(C₆-C₁₄ aryl)phenanthrolinyl group, a quinolinyl group, a C₁-C₁₀ alkyl quinolinyl group, a di(C₁-C₁₀ alkyl)quinolinyl group, a C₆-C₁₄ aryl quinolinyl group, a di(C₆-C₁₄ aryl)quinolinyl group, a benzoxazolyl group, a C₁-C₁₀ alkyl benzoxazolyl group, a di(C₁-C₁₀ alkyl)benzoxazolyl group, a C₆-C₁₄ aryl benzoxazolyl group, a di(C₆-C₁₄ aryl)benzoxazolyl group, a benzothiazolyl group, a C₁-C₁₀ alkyl benzothiazolyl group, a di(C₁-C₁₀ alkyl)benzothiazolyl group, a C₆-C₁₄ aryl benzothiazolyl group, a di(C₆-C₁₄ aryl)benzothiazolyl group, a benzimidazolyl group, a C₁-C₁₀ alkyl benzimidazolyl group, a di(C₁-C₁₀ alkyl)benzimidazolyl group, a C₆-C₁₄ aryl benzimidazolyl group, a di(C₆-C₁₄ aryl)benzimidazolyl group, an imidazolpyridinyl group, a C₁-C₁₀ alkyl imidazolpyridinyl group, a di(C₁-C₁₀ alkyl)imidazolpyridinyl group, a C₆-C₁₄ aryl imidazolpyridinyl group, a di(C₆-C₁₄ aryl)imidazolpyridinyl group, an imidazolpyrimidinyl group, a C₁-C₁₀ alkyl imidazolpyrimidinyl group, a di(C₁-C₁₀ alkyl)imidazolpyrimidinyl group, a C₆-C₁₄ aryl imidazolpyrimidinyl group, a di(C₆-C₁₄ aryl)imidazolpyrimidinyl group, a carbazolyl group, a C₁-C₁₀ alkyl carbazolyl group, a di(C₁-C₁₀ alkyl)carbazolyl group, a C₆-C₁₄ arylcarbazolyl group, and a di(C₆-C₁₄ aryl)carbazolyl group.

For example, Ar₁₁, Ar₁₂, and Ar₁₃ may be each independently selected from the group consisting of compounds represented by Formulae 3A through 3P below, but are not 26 limited thereto:

In the formulae above, Z₁, Z₂, Z₃, Z₁₁ and Z₁₂ are each independently selected from the group consisting of a hydrogen atom, a deuterium atom, a C₁-C₁₀ alkyl group (for example, methyl, ethyl, propyl, isobutyl, sec-butyl or the like), a C₁-C₁₀ alkoxy group (for example, methoxy, ethoxy, propoxy, isopropyloxy, butoxy or the like), and a C₆-C₁₄ aryl group (for example, phenyl, naphthyl or the like); p is an integer from 1 to 8; and * denotes a binding site with Ar₁, Ar₂, Ar₃, or Ar₄.

a, b, c and d may be each independently an integer from 0 to 10.

For example, a, b, c and d may be each independently 0, 1, 2 or 3.

“a” groups of —Ar₁— in —(Ar₁)_(a)—(Ar₁₁) may be identical to or different from each other, “b” groups of —Ar₂— in —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)] may be identical to or different from each other, “c” groups of —Ar₃— may be identical to or different from each other; and “d” groups of —Ar₄— may be identical to or different from each other.

When one of R₁ through R₁₄ is selected from among the groups represented by —(Ar₁)_(a)—(Ar₁₁) and a=0, the substituent group may be represented by —(Ar₁₁). When one of R₁ through R₁₄ is selected from among the groups represented by —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)], b≠0, and c=d=0, the substituent group may be represented by —(Ar₂)_(b)—N[—(Ar₁₂)][—(Ar₁₃)]. In this regard, Ar₁, Ar₂, Ar₃, Ar₄, Ar₁₁, Ar₁₂, Ar₁₃, a, b, c, and d may be defined as described above.

In Formula 1 of the heterocyclic compound, R₁ through R₁₄ may be each independently selected from the group consisting of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, an amino group, a nitro group, a hydroxy group, a substituted or unsubstituted C₁-C10 alkyl group, a group represented by —(Ar₁)_(a)—(Ar₁₁), and a group represented by —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)]; Ar₁ through Ar₄ may be each independently selected from the group consisting of a substituted or unsubstituted C₅-C₂₀ arylene group and a substituted or unsubstituted C₄-C₂₀ heteroarylene group; Ar₁₁, Ar₁₂ and Ar₁₃ may be each independently selected from the group consisting of a phenyl group, a C₁-C₁₀ alkyl phenyl group, a di(C₁-C₁₀ alkyl)phenyl group, a C₆-C₁₄ aryl phenyl group, a di(C₆-C₁₄ aryl)phenyl group, a naphthyl group, a C₁-C₁₀ alkyl naphthyl group, a di(C₁-C₁₀ alkyl)naphthyl group, a C₆-C₁₄ aryl naphthyl group, a di(C₆-C₁₄ aryl)naphthyl group, an anthryl group, a C₁-C₁₀ alkyl anthryl group, a di(C₁-C₁₀ alkyl)anthryl group, a C₆-C₁₄ aryl anthryl group, a di(C₆-C₁₄ aryl)anthryl group, a phenanthryl group, a C₁-C₁₀ alkyl phenanthryl group, a di(C₁-C₁₀ alkyl)phenanthryl group, a C₆-C₁₄ aryl phenanthryl group, a di(C₆-C₁₄ aryl)phenanthryl group, a fluorenyl group, a C₁-C₁₀ alkyl fluorenyl group, a di(C₁-C₁₀ alkyl)fluorenyl group, a C₆-C₁₄ aryl fluorenyl group, a di(C₆-C₁₄ aryl)fluorenyl group, a pyridyl group, a C₁-C₁₀ alkyl pyridyl group, a di(C₁-C₁₀ alkyl)pyridyl group, a pyrenyl group, a C₁-C₁₀ alkyl pyrenyl group, a di(C₁-C₁₀ alkyl)pyrenyl group, a C₆-C₁₄ aryl pyrenyl group, a di(C₆-C₁₄ aryl)pyrenyl group, a phenanthrolinyl group, a C₁-C₁₀ alkyl phenanthrolinyl group, a di(C₁-C₁₀ alkyl)phenanthrolinyl group, a C₆-C₁₄ aryl phenanthrolinyl group, a di(C₆-C₁₄ aryl)phenanthrolinyl group, a quinolinyl group, a C₁-C₁₀ alkyl quinolinyl group, a di(C₁-C₁₀ alkyl)quinolinyl group, a C₆-C₁₄ aryl quinolinyl group, a di(C₆-C₁₄ aryl)quinolinyl group, a benzoxazolyl group, a C₁-C₁₀ alkyl benzoxazolyl group, a di(C₁-C₁₀ alkyl)benzoxazolyl group, a C₆-C₁₄ aryl benzoxazolyl group, a di(C₆-C₁₄ aryl)benzoxazolyl group, a benzothiazolyl group, a C₁-C₁₀ alkyl benzothiazolyl group, a di(C₁-C₁₀ alkyl)benzothiazolyl group, a C₆-C₁₄ aryl benzothiazolyl group, a di(C₆-C₁₄ aryl)benzothiazolyl group, a benzimidazolyl group, a C₁-C₁₀ alkyl benzimidazolyl group, a di(C₁-C₁₀ alkyl)benzimidazolyl group, a C₆-C₁₄ aryl benzimidazolyl group, a di(C₆-C₁₄ aryl)benzimidazolyl group, an imidazolpyridinyl group, a C₁-C₁₀ alkyl imidazolpyridinyl group, a di(C₁-C₁₀ alkyl)imidazolpyridinyl group, a C₆-C₁₄ aryl imidazolpyridinyl group, a di(C₆-C₁₄ aryl)imidazolpyridinyl group, an imidazolpyrimidinyl group, a C₁-C₁₀ alkyl imidazolpyrimidinyl group, a di(C₁-C₁₀ alkyl)imidazolpyrimidinyl group, a C₆-C₁₄ aryl imidazolpyrimidinyl group, a di(C₆-C₁₄ aryl)imidazolpyrimidinyl group, a carbazolyl group, a C₁-C₁₀ alkyl carbazolyl group, a di(C₁-C₁₀ alkyl)carbazolyl group, a C₆-C₁₄ aryl carbazolyl group, and a di(C₆-C₁₄ aryl)carbazolyl group; and a, b, c and d may be independently an 18 integer of 0, 1, 2, or 3.

The heterocyclic compound may be represented by Formula 2 below; i.e., a compound of Formula 1 wherein R₄, R₅, R₆, R₇, R₁₁, R₁₂, R₁₃ and R₁₄ are hydrogen atoms:

In Formula 2 above, R₁, R₂, R₃, R₈, R₉ and R₁₀ are each independently selected from the group consisting of a substituted or unsubstituted C₁-C₅₀ alkyl group, a substituted or unsubstituted C₂-C₅₀ alkenyl group, a substituted or unsubstituted C₂-C₅₀ alkynyl group, a substituted or unsubstituted C₃-C₅₀ cycloalkyl group, a substituted or unsubstituted C₁-C₅₀ alkoxy group, a group represented by —(Ar₁)_(a)—(Ar₁₁), and a group represented by —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)], wherein at least two adjacent groups of R₁ through R₃ may be linked to form a saturated or unsaturated ring.

Ar₁, Ar₂, Ar₃, Ar₄, Ar₁₁, Ar₁₂, Ar₁₃, a, b, c and d may be defined as described above in conjunction with Formula 1.

When one of R₁, R₂, R₃, R₈, R₉ and R₁₀ is selected from among the groups represented by —(Ar₁)_(a)—(Ar₁₁) and a=0, the substituent group may be represented by —(Ar₁₁). When one of R₁, R₂, R₃, R₈, R₉ and R₁₀ is selected from among the groups represented by —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)], b≠0, and c=d=0, the substituent group may be represented by —(Ar₂)_(b)—N[—(Ar₁₂)][—(Ar₁₃)].

For example, in Formula 2 of the heterocyclic compound, R₁ and R₈ may be each independently selected from the group consisting of a group represented by —(Ar₁)_(a)—(Ar₁₁) and a group represented by —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)]; R₂, R₃, R₉ and R₁₀ may be each independently selected from the group consisting of a methyl group and a phenyl group; Ar₁ through Ar₄ may be each independently selected from the group consisting of a substituted or unsubstituted C₅-C₂₀ arylene group and a substituted or unsubstituted C₄-C₂₀ heteroarylene group; Ar₁₁, Ar₁₂ through Ar₁₃ are each independently selected from the group consisting of a phenyl group, a C₁-C₁₀ alkyl phenyl group, a di(C₁-C₁₀ alkyl)phenyl group, a C₆-C₁₄ aryl phenyl group, a di(C₆-C₁₄ aryl)phenyl group, a naphthyl group, a C₁-C₁₀ alkyl naphthyl group, a di(C₁-C₁₀ alkyl)naphthyl group, a C₆-C₁₄ aryl naphthyl group, a di(C₆-C₁₄ aryl)naphthyl group, an anthryl group, a C₁-C₁₀ alkyl anthryl group, a di(C₁-C₁₀ alkyl)anthryl group, a C₆-C₁₄ aryl anthryl group, a di(C₆-C₁₄ aryl)anthryl group, a phenanthryl group, a C₁-C₁₀ alkyl phenanthryl group, a di(C₁-C₁₀ alkyl)phenanthryl group, a C₆-C₁₄ aryl phenanthryl group, a di(C₆-C₁₄ aryl)phenanthryl group, a fluorenyl group, a C₁-C₁₀ alkyl fluorenyl group, a di(C₁-C₁₀ alkyl)fluorenyl group, a C₆-C₁₄ aryl fluorenyl group, a di(C₆-C₁₄ aryl)fluorenyl group, a pyridyl group, a C₁-C₁₀ alkyl pyridyl group, a di(C₁-C₁₀ alkyl)pyridyl group, a pyrenyl group, a C₁-C₁₀ alkyl pyrenyl group, a di(C₁-C₁₀ alkyl)pyrenyl group, a C₆-C₁₄ aryl pyrenyl group, a di(C₆-C₁₄ aryl)pyrenyl group, a phenanthrolinyl group, a C₁-C₁₀ alkyl phenanthrolinyl group, a di(C₁-C₁₀ alkyl)phenanthrolinyl group, a C₆-C₁₄ aryl phenanthrolinyl group, a di(C₆-C₁₄ aryl)phenanthrolinyl group, a quinolinyl group, a C₁-C₁₀ alkyl quinolinyl group, a di(C₁-C₁₀ alkyl)quinolinyl group, a C₆-C₁₄ aryl quinolinyl group, a di(C₆-C₁₄ aryl)quinolinyl group, a benzoxazolyl group, a C₁-C₁₀ alkyl benzoxazolyl group, a di(C₁-C₁₀ alkyl)benzoxazolyl group, a C₆-C₁₄ aryl benzoxazolyl group, a di(C₆-C₁₄ aryl)benzoxazolyl group, a benzothiazolyl group, a C₁-C₁₀ alkyl benzothiazolyl group, a di(C₁-C₁₀ alkyl)benzothiazolyl group, a C₆-C₁₄ aryl benzothiazolyl group, a di(C₆-C₁₄ aryl)benzothiazolyl group, a benzimidazolyl group, a C₁-C₁₀ alkyl benzimidazolyl group, a di(C₁-C₁₀ alkyl)benzimidazolyl group, a C₆-C₁₄ aryl benzimidazolyl group, a di(C₆-C₁₄ aryl)benzimidazolyl group, an imidazolpyridinyl group, a C₁-C₁₀ alkyl imidazolpyridinyl group, a di(C₁-C₁₀ alkyl)imidazolpyridinyl group, a C₆-C₁₄ aryl imidazolpyridinyl group, a di(C₆-C₁₄ aryl)imidazolpyridinyl group, an imidazolpyrimidinyl group, a C₁-C₁₀ alkyl imidazolpyrimidinyl group, a di(C₁-C₁₀ alkyl)imidazolpyrimidinyl group, a C₆-C₁₄ aryl imidazolpyrimidinyl group, a di(C₆-C₁₄ aryl)imidazolpyrimidinyl group, a carbazolyl group, a C₁-C₁₀ alkyl carbazolyl group, a di(C₁-C₁₀ alkyl)carbazolyl group, a C₆-C₁₄ aryl carbazolyl group, and a di(C₆-C₁₄ aryl)carbazolyl group; and a, b, c and d may be independently an integer of 0, 1, 2 or 3.

Examples of the heterocyclic compound of Formula 1 include, but are not limited to, Compounds 1 through 36 represented below. However, the compounds represented by Formula 1 are not limited thereto.

The C₁-C₅₀ alkyl group used herein may be a linear or branched group. Examples of the C₁-C₅₀ alkyl group include, but are not limited to, methyl, ethyl, propyl, isobutyl, sec-butyl, pentyl, iso-amyl, hexyl, heptyl, octyl, nonanyl, and dodecyl. At least one hydrogen atom of the C₁-C₅₀ so alkyl group may be substituted with a deuterium atom, a halogen atom, a cyano group, an amino group, an amidino group, a nitro group, a hydroxyl group, a hydrazinyl group, a hydrazonyl group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid or a salt thereof, a C₁-C₃₀ alkyl group, a C₁-C₃₀ alkoxy group, a C₂-C₃₀ alkenyl group, a C₂-C₃₀ alkynyl group, a C₆-C₂₀ aryl group, a C₄-C₂₀ heteroaryl group, —N(Q₁)(Q₂), or —Si(Q₃)(Q₄)(Q₅), wherein Q₁ through Q₅ may be each selected from the group consisting of a hydrogen atom, deuterium atom, a halogen atom, a cyano group, an amino group, an amidino group, a nitro group, a hydroxyl group, a hydrazinyl group, a hydrazonyl group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid or a salt thereof, a C₁-C₃₀ alkyl group, a C₁-C₃₀ alkoxy group, a C₂-C₃₀ alkenyl group, a C₂-C₃₀ alkynyl group, a C₆-C₂₀ aryl group, or a C₄-C₂₀ heteroaryl group.

The unsubstituted C₂-C₅₀ alkenyl group indicates a hydrocarbon having at least one carbon-carbon double bond in the center or at a terminal of the unsubstituted C₂-C₅₀ alkyl group. Examples of the alkenyl group include an ethenyl group, a propenyl group, a butenyl group, and the like. At least one hydrogen atom in the unsubstituted C₂-C₅₀ alkenyl group may be substituted with the substituents described in conjunction with the substituted C₁-C₅₀ alkyl group.

The unsubstituted C₂-C₅₀ alkynyl group indicates a hydrocarbon having at least one carbon-carbon triple bond in the center or at a terminal of the C₂-C₅₀ alkyl group defined above. Examples of the unsubstituted C₂-C₂₀ alkynyl group include acetylene, propylene, phenylacetylene, naphthylacetylene, isopropylacetylene, t-butylacetylene, and diphenylacetylene. At least one hydrogen atom in the alkynyl group may be substituted with the substituents described above in conjunction with the C₁-C₅₀ alkyl group.

The unsubstituted C₃-C₅₀ cycloalkyl group used herein refers to a C₃-C₅₀ cyclic alkyl group wherein at least one hydrogen atom in the cycloalkyl group may be substituted with substituents described above in connection with the C₁-C₅₀ alkyl group.

The unsubstituted C₁-C₅₀ alkoxy group used herein is a group having a structure of —OA wherein A is an unsubstituted C₁-C₅₀ alkyl group as described above. Examples thereof include a methoxy group, an ethoxy group, a propoxy group, an isopropyloxy group, a butoxy group, and a pentoxy group. At least one hydrogen atom of the alkoxy group may be substituted with the same substituent groups as described above in conjunction with the C₁-C₅₀ alkyl group.

The unsubstituted C₅-C₆₀ aryl group used herein refers to a carbocyclic aromatic system containing at least one ring. At least two rings may be fused to each other or linked to each other by a single bond. The term ‘aryl’ refers to an aromatic system, such as phenyl, naphthyl, or anthracenyl. At least one hydrogen atom in the aryl group may be substituted with the substituents described above in conjunction with the C₁-C₅₀ alkyl group. Examples of the substituted or unsubstituted C₆-C₃₀ aryl group include, but are not limited to, a phenyl group, a C₁-C₁₀ alkylphenyl group (for example, an ethylphenyl group), a halophenyl group (for example, an o-, m-, and p-fluorophenyl group, a dichlorophenyl group), a cyanophenyl group, dicyanophenyl group, a trifluoromethoxyphenyl group, a biphenyl group, a halobiphenyl group, a cyanobiphenyl group, a C₁-C₁₀ alkyl biphenyl group, a C₁-C₁₀ alkoxybiphenyl group, a o-, m-, and p-toryl group, an o-, m-, and p-cumenyl group, a mesityl group, a phenoxyphenyl group, a (α,α-dimethylbenzene)phenyl group, a (N,N′-dimethyl)aminophenyl group, a (N,N′-diphenyl)aminophenyl group, a pentalenyl group, an indenyl group, a naphthyl group, a halonaphthyl group (for example, a fluoronaphthyl group), a C₁-C₁₀ alkylnaphthyl group (for example, a methylnaphthyl group), a C₁-C₁₀ alkoxynaphthyl group (for example, a methoxynaphthyl group), a cyanonaphthyl group, an anthracenyl group, an azulenyl group, a heptalenyl group, an acenaphthylenyl group, a phenalenyl group, a fluorenyl group, an anthraquinolyl group, a methylanthryl group, a phenanthryl group, a triphenylene group, a pyrenyl group, a chrycenyl group, an ethyl-chrysenyl group, a picenyl group, a perylenyl group, a chloroperylenyl group, a pentaphenyl group, a pentacenyl group, a tetraphenylenyl group, a hexaphenyl group, a hexacenyl group, a rubicenyl group, a coronelyl group, a trinaphthylenyl group, a heptaphenyl group, a heptacenyl group, a pyranthrenyl group, and an ovalenyl group.

The unsubstituted C₅-C₅₀ aryloxy group is a group represented by —OA1 wherein A1 is a C₅-C₆₀ aryl group. Examples of the aryloxy group may include a phenoxy group. At least one hydrogen atom in the aryloxy group may be substituted with the substituents described above in conjunction with the C₁-C₅₀ alkyl group.

The unsubstituted C₅-C₅₀ arylthio group is a group represented by —SA1 wherein A1 is a C₅-C₆₀ aryl group. Examples of the arylthio group include, but are not limited to, a phenylthio group, a naphthylthio group, and a fluorenylthio group. At least one hydrogen atom in the arylthio group may be substituted with the substituents described above in conjunction with the C₁-C₅₀ alkyl group.

The unsubstituted C₄-C₆₀ heteroaryl group used herein includes one, two or three hetero atoms selected from among N, O, P and S. At least two rings may be fused to each other or linked to each other by a single bond. Examples of the unsubstituted C₄-C₆₀ heteroaryl group may include a pyrazolyl group, an imidazolyl group, an oxazolyl group, a thiazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a pyridinyl group, a pyridazinyl group, a pyrimidinyl group, a triazinyl group, a carbazolyl group, an indolyl group, a quinolinyl group, and an isoquinolinyl group. At least one hydrogen atom in the heteroaryl group may be substituted with the substituents described above in conjunction with the C₁-C₅₀ alkyl group.

Throughout the specification a saturated ring or unsaturated ring formed by the linking of at least two adjacent substituents indicates a substituent including at least two rings formed by the fusing of at least one aromatic ring and/or at least one non-aromatic ring. Examples of this substituent include some of the substituents described above in conjunction with the aryl group or heteroaryl group.

An organic light-emitting device according to an embodiment of the present invention includes a first electrode, a second electrode disposed opposite to the first electrode, and an organic layer disposed between the first electrode and the second electrode, the organic layer including the heterocylic compound of Formula 1 described above.

The heterocyclic compound of Formula 1 may be suitable as a material for an emission layer, an electron transport layer or an electron injection layer of an organic light-emitting device. Due to the inclusion of the heterocylic group in its molecular structure, the heterocyclic compound of Formula 1 may have a high glass transition temperature (Tg) or a high melting point, and may prevent crystallization. An organic light-emitting device manufactured using the heterocyclic compound of Formula 1, which has a symmetrical structure in which a chrysene group and an indole group are fused, has excellent durability when stored or operated. If further including a substituent, such as a fluorene group, the heterocyclic compound of Formula 1 may have a higher glass transition temperature (Tg) or a higher decomposition temperature (Td), and thus, the organic light-emitting device may have improved characteristics at high temperatures. Thus, when such a heterocyclic compound is used as an organic emission material, resistance to Joule's heat produced inside organic layers, between organic layers, or between an organic layer and a metal electrode may be increased, and resistance to a high-temperature environment may be increased.

The organic layer including the heterocyclic compound of Formula 1 may be an electron injection layer, an electron transport layer, an emission layer, or a single layer having both the abilities to inject and transport electrons.

For example, the organic layer including the heterocyclic compound of Formula 1 may be an emission layer. In this case, the heterocyclic compound of Formula 1 may be used as a fluorescent host, a phosphorescent host, or a fluorescent dopant.

In the organic light-emitting device according to the current embodiment of the present invention, when the emission layer, the electron injection layer or the electron transport layer includes the heterocyclic compound of Formula 1, the emission layer may include an anthracene compound, an arylamine compound or a styryl compound, which are widely known, wherein the anthracene compound, the arylamine compound or the styryl compound may be unsubstituted or substituted with a substituent described above in conjunction with the C₁-C₅₀ alkyl group.

In the organic light-emitting device according to the current embodiment of the present invention, when the electron injection layer or the electron transport layer includes the heterocyclic compound of Formula 1, a red emission layer, a green emission layer, a blue emission layer or a white emission layer may include a widely-known phosphorescent compound.

Meanwhile, the first electrode may be an anode, and the second electrode may be a cathode, but the reverse is also possible.

In the organic light-emitting described above, the organic layer may further include at least one layer selected from the group consisting of a hole injection layer, a hole transport layer, an electron blocking layer, an emission layer, a hole blocking layer, an electron transport layer and an electron injection layer, if required.

For example, the organic light-emitting device according to the current embodiment of the present invention may have a structure of first electrode/hole injection layer/emission layer/second electrode, a structure of first electrode/hole injection layer/hole transport layer/emission layer/electron transport layer/second electrode, or a structure of first electrode/hole injection layer/hole transport layer/emission layer/electron transport layer/electron injection layer/second electrode. Alternatively, the organic light-emitting device may also have a first electrode/single layer having both hole injection and hole transport capabilities/EML/ETL/second electrode structure, or a first electrode/single layer having both hole injection and hole transport capabilities/EML/ETL/EIL/second electrode structure.

The organic light emitting device according to the current embodiment of the present invention may be a top-emission organic light-emitting device or a bottom-emission organic light-emitting device.

Hereinafter, a method of manufacturing an OLED according to an embodiment of the present invention will be described with reference to FIG. 1. Referring to FIG. 1, the organic light-emitting device according to the present embodiment includes a substrate, a first electrode (anode), a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), an electron injection layer (EIL), and a second electrode (cathode).

First, the first electrode is formed by depositing a first electrode-forming material having a high work function on a substrate, by deposition or sputtering. The first electrode may constitute an anode or a cathode. The substrate may be any substrate that is used in conventional organic light emitting devices. In this regard, the substrate may be a glass or transparent plastic substrate with excellent mechanical strength, thermal stability, transparency, surface smoothness, ease of handling, and water resistance. Examples of the first electrode material include materials, such as indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO2), zinc oxide (ZnO), aluminum (Al), silver (Ag), and magnesium (Mg), which have excellent conductivity. The first electrode may be formed as a transparent or reflective electrode.

Then, a HIL may be formed on the first electrode by vacuum deposition, spin coating, casting, Langmuir Blodgett (LB) deposition, or the like.

When the HIL is formed using vacuum deposition, the deposition conditions may vary according to a material that is used to form the HIL, and the structure and thermal characteristics of the HIL to be formed. For example, the deposition conditions may include a deposition temperature of 100 to 500° C., a vacuum pressure of 10⁻⁸ to 10⁻³ torr, and a deposition rate of 0.01 to 100 Å/sec.

When the HIL is formed by spin coating, coating conditions may vary according to a material that is used to form the HIL, and the desired structure and thermal properties of the HIL to be formed. For example, the coating speed may be in a range of about 2000 rpm to about 5000 rpm, and a temperature for heat treatment, which is performed to remove a solvent after coating, may be in a range of about 80° C. to about 200° C.

The HIL may be formed of any known materials used to form a HIL. Examples of the HIL material include, but are not limited to, a phthalocyanine compound such as copper phthalocyanine, 4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine (m-MTDATA), N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4″-diamine (NPB), TDATA, 2-TNATA, polyaniline/dodecylbenzenesulfonic acid (Pani/DBSA), poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate (PEDOT/PSS), polyaniline/camphor sulfonic acid (Pani/CSA), and (polyaniline)/poly(4-styrenesulfonate) (PANI/PSS).

The thickness of the HIL may be in a range of about 100 to about 10,000 Å, for example, about 100 to about 1,000 Å. When the thickness of the HIL is within the above range, the HIL may have excellent hole injection characteristics without a substantial increase in driving voltage.

Then, a HTL may be formed on the HIL by vacuum deposition, spin coating, casting, Langmuir-Blodgett (LB) deposition, or the like. When the HTL is formed using vacuum deposition or spin coating, the deposition or coating conditions may be similar to those applied to form the HIL, though the deposition or coating conditions may vary according to the material that is used to form the HTL.

The HTL may be formed of any known materials used to form a HTL. Examples of the HTL material include, but are not limited to, cabazol derivatives such as N-phenylcarbazol or polyvinylcarbazol, and amine derivatives having an aromatic condensed ring, such as N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4″-diamine (NPB) and N,N′-bis(3-methylphenyl)-N,N′-diphenyl-[1,1-biphenyl]-4,4′-diamine (TPD). Among these materials, TCTA may not only transport holes but also inhibit excitons from being diffused from the EML.

The thickness of the HTL may be in the range of about 50 to 1,000 Å, for example, about 100 to about 2,500 Å. When the thickness of the HTL is within the above range, the HTL may have excellent hole transport characteristics without a substantial increase in driving voltage.

Then, an EML may be formed on the HTL by vacuum deposition, spin coating, casting, LB, or the like. When the EML is formed using vacuum deposition or spin coating, the deposition or coating conditions may be similar to those applied to form the HIL, though the deposition and coating conditions may vary according to the material that is used to form the EML.

The EML may include the heterocyclic compound of Formula 1 described above. For example, the heterocyclic compound of Formula 1 may be used as a host or a dopant. In addition to the heterocyclic compound of Formula 1, various known light-emitting materials, such as known hosts and dopants, may be used to form the EML. Dopants used to form the EML may include either a fluorescent dopant or a phosphorescent dopant, which are widely known in the art.

Examples of the host may include, but are not limited to, Alq3, 4,4′-N,N′-dicarbazole-biphenyl (CPB), 9,10-di(naphthalene-2-yl)anthracene (ADN, and distyrylarylene (DSA).

Examples of known dopants include, but are not limited to, PtOEP, Ir(piq)₃, Btp₂Ir(acac), Ir(ppy)₃ (ppy=phenylpyridine), Ir(ppy)₂ (acac), Ir(mpyp)₃, C545T(10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1H,5H,11H-(1)benzopyropyrano(6,7-8-i,j)quinolizine-11-on), F₂Irpic, (F₂ppy)₂Ir(tmd), Ir(dfppz)₃, ter-fluorene, 4,4′-bis(4-diphenylaminostyryl)biphenyl (DPAVBi), and 2,5,8,11-tetra-t-butyl pherylene (TBP).

The amount of the dopant may be in a range of about 0.1 to about 20 parts by weight, for example, about 0.5 to about 12 parts by weight based on 100 parts by weight of the EML-forming material (i.e., the total weight of the host and the dopant). When the amount of the dopant is within the above range, concentration quenching may be substantially prevented.

The thickness of the EML may be in the range of about 100 to about 1,000 Å, for example, about 200 to about 600 Å. When the thickness of the EML is within the above range, the EML may have excellent light-emitting characteristics without a substantial increase in driving voltage.

When the EML includes a phosphorescent dopant, a hole blocking layer (HBL, not shown in FIG. 1) may be formed on the EML in order to prevent diffusion of triplet excitons or holes into the ETL. In this case, the HBL may be formed of any material that is commonly used to form a HBL, without limitation. Examples of such HBL materials include, but are not limited to, oxadiazole derivatives, triazole derivatives, phenathroline derivatives, Balq, and BCP.

The thickness of the HBL may be in a range of about 50 to 1,000 Å, for example, about 100 to about 400 Å. When the thickness of the HBL is within the above range, the HBL may have excellent hole blocking characteristics without a substantial increase in driving voltage.

Then, an ETL may be formed on the HBL or EML by vacuum deposition, spin coating, casting, or the like. When the ETL is formed using vacuum deposition or spin coating, the deposition or coating conditions may be similar to those applied to form the HIL, though the deposition and coating conditions may vary according to the material that is used to form the ETL.

The ETL material may include the heterocyclic compound of Formula 1 described above. In addition to the heterocyclic compound of Formula 1, any known ETL materials may be used to form the ETL. Examples of the ETL material include, but are not limited to, quinoline derivatives, such as tris(8-quinolinolate)aluminum (Alq3), TAZ, and Balq.

The thickness of the ETL may be in a range of about 100 to about 1,000 Å, for example, about 100 to about 500 Å. When the thickness of the ETL is within the above range, the ETL may have excellent electron transport characteristics without a substantial increase in driving voltage.

In addition, the EIL, which facilitates injection of electrons from the cathode, may be formed on the ETL.

The EIL may include the heterocyclic compound of Formula 1 described above. In addition to the heterocyclic compound of Formula 1, any known EIL materials, such as LiF, NaCl, CsF, Li2O, and BaO, may be used to form the EIL. The deposition or coating conditions for forming the EIL may be similar to those applied to form the HIL, though the deposition and coating conditions may vary according to the material that is used to form the EIL.

The thickness of the EIL may be in a range of about 1 to about 100 Å, for example, about 5 to about 90 Å. When the thickness of the EIL is within the above range, the EIL may have excellent electron injection characteristics without a substantial increase in driving voltage.

Finally, the second electrode may be formed on the EIL using, for example, vacuum deposition, sputtering, or the like. The second electrode may constitute a cathode or an anode. The material for forming the second electrode may include a metal, an alloy, or an electrically conductive compound, materials which have a low work function, or a mixture thereof. Examples of such materials may include, but are not limited to, lithium (Li), magnesium (Mg), aluminum (Al), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), and magnesium-silver (Mg—Ag). In addition, in order to manufacture a top-emission organic light-emitting device, a transparent cathode formed of a transparent material such as ITO or IZO may be used as the second electrode.

The organic light-emitting device according to the current embodiment of the present invention may be used in various types of flat panel display devices, such as in a passive matrix organic light-emitting display device or in an active matrix organic light-emitting display device. In particular, when the organic light-emitting device is included in an active matrix organic light-emitting display device including a thin-film transistor, the first electrode on the substrate may function as a pixel electrode, electrically connected to a source electrode or a drain electrode of the thin-film transistor. Moreover, the organic light-emitting device may also be included in a flat panel display device having a double-sided screen.

At least one layer of the organic light-emitting device according to the embodiment described above may be formed of the heterocyclic compound of Formula 1 by using a deposition method or a wet method of coating a solution of the heterocylic compound of Formula 1.

Hereinafter, synthesis examples of Compounds 4, 20, 21, 27 and 28 and examples will be described in detail. However, these examples are not intended to limit the purpose and scope of the one or more embodiments of the present invention.

EXAMPLES Synthesis Example Synthesis of Compound 4

Synthesis of Intermediate 1

3.84 g (10 mmol) of 6,12-dibromochrysene, 2.16 g (11 mmol) of benzophenone hydrazone, 1.44 g (15 mmol) of t-BuONa, 45 mg (0.2 mmol) of Pd(OAc)₂, and 82 mg (0.2 mmol) of 2-dicyclohexylphospino-2′,4′,6′-triisopropylphenyl were dissolved in 50 mL of toluene, and stirred at 90° C. for 3 hours. The reaction product was cooled to room temperature. Distilled water was added thereto and extracted twice with 80 mL of diethylether and once with 80 mL of dichloromethane. The organic phase was collected and dried using magnesium sulfate, followed by filtration. The solvent was evaporated to obtain a residue. The residue was separated and purified using silica gel column chromatography to obtain 5.7 g of Intermediate 1 with a yield of 92%. This compound was identified using high-resolution mass spectroscopy (HR-MS). (calc: 616.2627, found: 616.2618)

Synthesis of Intermediate 2

6.2 g (20 mmol) of Intermediate 1 and 3.8 g (20 mmol) of p-toluenesulfonic acid monohydrate were dissolved in 50 mL of methylethylketone and stirred at 110° C. for 24 hours. The reaction product was cooled to room temperature. Distilled water was added thereto and extracted twice with 80 mL of diethylether and twice with 80 mL of dichloromethane. The organic phase was collected and dried using magnesium sulfate, followed by filtration. The solvent was evaporated to obtain a residue. The residue was separated and purified using silica gel column chromatography to obtain 2.5 g of Intermediate 2 with a yield of 69%. This compound was identified using HR-MS. (calc: 360.1626, found: 360.1513)

Synthesis of Compound 4

2.5 g (7.0 mmol) of Intermediate 2, 3.8 g (14 mmol) of 9-bromofluorene, 2.0 g (21 mmol) of t-BuONa, 260 mg (0.28 mmol) of Pd₂(dba)₃, and 56 mg (0.28 mmol) of P(t-Bu)₃ were dissolved in 50 ml of toluene and stirred at 90° C. for 3 hours in a nitrogen atmosphere. After the reaction was completed, the reaction product was cooled to room temperature, and then extracted three times with distilled water and 50 ml of diethylether. The organic phase was collected and dried using magnesium sulfate. The solvent was evaporated to obtain a residue. The residue was separated and purified using silica gel column chromatography to obtain 3.5 g of Compound 4 with a yield of 67%. This compound was identified using HR-MS. (calc: 746.3661, found: 746.3761)

Synthesis Example Synthesis of Compound 20

Compound 20 was synthesized with a yield of 71% in the same manner as that of Compound 5, except that 2-(4-bromophenyl)-imidazolpyrimidine was used instead of 9-bromofluorene. This compound was identified using HR-MS. (calc: 748.3063, found: 748.3321)

Synthesis Example Synthesis of Compound 21

Compound 21 was synthesized with a yield of 65% in the same manner as that of Compound 5, except that 3-bromo-(1.10)-phenanthroline was used instead of 9-bromofluorene. This compound was identified using HR-MS. (calc: 718.2845, found: 718.2547)

Synthesis Example Synthesis of Compound 27 Synthesis of Intermediate 3

6.2 g (10 mmol) of Intermediate 1, 1.90 g (10.0 mmol) of p-toluenesulfonic acid monohydrate, 2.0 g (10.0 mmol) of benzylphenylketone were dissolved in 80 mL of ethanol and 20 mL of toluene and stirred at 110° C. for 24 hours. The reaction product was cooled to room temperature. Distilled water was added thereto and extracted twice with 50 mL of diethylether and twice with 50 mL of dichloromethane. The organic phase was collected and dried using magnesium sulfate, followed by filtration. The solvent was evaporated to obtain a residue. The residue was separated and purified using silica gel column chromatography to obtain 4.8 g of Intermediate 3 with a yield of 79%. This compound was identified using HR-MS. (calc: 608.2252, found: 608.2623)

Synthesis of Compound 27

Compound 27 was synthesized with a yield of 68% in the same manner as that of Compound 5, except that Intermediate 3 and 2-(4-bromophenyl)-1-phenyl-1-benzimidazole were used, instead of Intermediate 2 and 9-bromofluorene. This compound was identified using HR-MS. (calc: 1146.4410, found: 1146.4352)

Synthesis Example Synthesis of Compound 28 Synthesis of Intermediate 4

3.08 g (13 mmol) of 2,5-dibromopyridine, 1.23 g (10 mmol) of 4-pyridyl boronic acid, 0.58 g (0.5 mmol) of Pd(PPh₃)₄, and 5.53 g (40 mmol) of K₂CO₃ were dissolved in 50 ml of a mixed solution THF/H₂O (2:1), and stirred at 80° C. for 5 hours. The reaction solution was extracted three times with 60 ml of diethylether. The organic phase was collected and dried using magnesium sulfate. The solvent was evaporated to obtain a residue. The residue was recrystallized with dichloromethane and normal hexane to obtain 1.74 g of Intermediate 4 with a yield of 74%. This compound was identified using HR-MS. (calc: 233.9793, found: 234.9349)

Synthesis of Compound 28

Compound 28 was synthesized with a yield of 70% in the same manner as that of Compound 5, except that Intermediate 3 and Intermediate 4 were used, instead of Intermediate 2 and 9-bromofluorene, respectively. This compound was identified using HR-MS. (calc: 918.3471, found: 918.3645)

Example 1

To produce an anode, a corning 15 Ω/cm² (1200 Å) ITO glass substrate was cut to a size of 50 mm×50 mm×0.7 mm and then sonicated in isopropyl alcohol and pure water each for five minutes, and then cleaned by irradiation of ultraviolet rays for 30 minutes and exposure to ozone. The resulting glass substrate was mounted on a vacuum deposition device.

Then, first, 2-TNATA, which is a known HIL material, was vacuum-deposited on the glass substrate to form a HIL having a thickness of 600 Å. Then, N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4″-diamine (NPB), which is a known hole transporting compound, was vacuum-deposited on the HIL to form a HTL having a thickness of 300 Å.

Then, a green luorescent host Alq3 and a green fluorescent dopant C545T were simultaneously deposited in a weight ratio of 98:2 on the HTL, to form an EML having a thickness of 300 Å.

Then, Compound 4 was deposited on the EML to form an ETL having a thickness of 300 Å, and then LiF, which is a halogenated alkali metal, was deposited on the ETL to form an EIL having a thickness of 10 Å. Then, Al was vacuum-deposited on the EIL to form a cathode having a thickness of 3000 Å, thereby forming a LiF/Al electrode. As a result, an organic light-emitting device was completely manufactured.

The organic light-emitting device had a driving voltage of 6.36V at a current density of 50 mA/cm², a high luminosity of 7.235 cd/m², a color coordinate of (0.313, 0.641), and a luminescent efficiency of 14.47 cd/A.

Example 2

An organic light-emitting device was manufactured in the same manner as in Example 1, except that Compound 20 was used, instead of Compound 4, to form the ETL.

Example 3

An organic light-emitting device was manufactured in the same manner as in Example 1, except that Compound 21 was used, instead of Compound 4, to form the ETL.

Example 4

An organic light-emitting device was manufactured in the same manner as in Example 1, except that Compound 27 was used, instead of Compound 4, to form the ETL.

Example 5

An organic light-emitting device was manufactured in the same manner as in Example 1, except that Compound 28 was used, instead of Compound 4, to form the ETL.

Comparative Example 1

An organic light-emitting device was manufactured in the same manner as in Example 1, except that Alq3 was used, instead of Compound 4, to form the ETL.

The organic light-emitting devices of Examples 1 through 5 had a driving voltage lower by 1V or greater than the organic light-emitting device of Comparative Example 1, and had higher efficiency and excellent I-V-L characteristics. In particular, lifetime characteristics were markedly improved by 100% or greater in the organic light-emitting devices of Examples 1 through 4, as compared to thr organic light-emitting device of Comparative Example 1.

TABLE 1 Driving Current Luminescent Voltage Density Luminance Efficiency Color Half life-span ETL Material (V) (mA/cm²) (cd/m²) (cd/A) Coordinates (hr@ 100 mA/cm²) Example 1 Compound 4 6.36 50 7.235 14.47 (0.313, 0.641) 403 Example 2 Compound 6.36 50 8.126 16.25 (0.307, 0.644) 472 20 Example 3 Compound 6.36 50 7.165 14.30 (0.311, 0.639) 415 21 Example 4 Compound 6.36 50 7.962 15.92 (0.309, 0.646) 489 27 Example 5 Compound 6.36 50 8.381 16.76 (0.310, 0.656) 502 28 Comparative Alq3 7.45 50 6.102 12.2 (0.309, 0.642) 237 Example 1

As described above, novel heterocyclic compounds according to the one or more of the above embodiments of the present invention have excellent emission characteristics and charge transporting capability, and thus may be used as an electron injecting/transporting material for most color-fluorescent and phosphorescent devices, such as red, green, blue, and white fluorescent and phosphorescent devices, or as a green, blue or white-light emitting material. Thus, an organic light-emitting device with high-efficiency, low-driving voltage, high luminance and long lifespan may be manufactured using the heterocylic compounds.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. 

What is claimed is:
 1. A heterocyclic compound represented by Formula 1 below:

wherein, in Formula 1, R₁ through R₁₄ are each independently selected from the group consisting of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, an amino group, a nitro group, a hydroxyl group, a carboxyl group, a substituted or unsubstituted C₁-C₅₀ alkyl group, a substituted or unsubstituted C₂-C₅₀ alkenyl group, a substituted or unsubstituted C₂-C₅₀ alkynyl group, a substituted or unsubstituted C₃-C₅₀ cycloalkyl group, a substituted or unsubstituted C₁-C₅₀ alkoxy group, a group represented by —(Ar₁)_(a)—(Ar₁₁), and a group represented by —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)], wherein at least two adjacent groups of R₁ through R₁₄ are linked to form a saturated or unsaturated ring; wherein Ar₁ through Ar₄ are each independently selected from the group consisting of a substituted or unsubstituted C₅-C₂₀ arylene group and a substituted or unsubstituted C₄-C₂₀ heteroarylene group; Ar₁₁, Ar₁₂ and Ar₁₃ are each independently selected from the group consisting of a substituted or unsubstituted C₅-C₆₀ aryl group, a substituted or unsubstituted C₅-C₅₀ aryloxy group, a substituted or unsubstituted C₅-C₅₀ arylthio group, and a substituted or unsubstituted C₄-C₆₀ heteroaryl group; a, b, c and d are each independently an integer from 0 to 10; and —(Ar₁)_(a)— groups in —(Ar₁)_(a)—(Ar₁₁) are identical to or different from each other, —(Ar₂)_(b)— groups in —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)] are identical to or different from each other, —(Ar₃)_(c)— groups are identical to or different from each other, and —(Ar₄)_(d)— groups are identical to or different from each other.
 2. A heterocyclic compound of claim 1, wherein at least two adjacent groups of R₄ through R₇ and R₁₁ through R₁₄ are linked to form a saturated or unsaturated ring.
 3. A heterocyclic compound of claim 1, wherein Ar₁ through Ar₄ are each independently selected from the group consisting of a phenylene group, a C₁-C₁₀ alkyl phenylene group, a di(C₁-C₁₀ alkyl)phenylene group, a naphthylene group, a C₁-C₁₀ alkyl naphthylene group, a di(C₁-C₁₀ alkyl)naphthylene group, an anthrylene group, a C₁-C₁₀ alkyl anthrylene group, a di(C₁-C₁₀ alkyl)anthrylene group, a fluorenylene group, a C₁-C₁₀ alkyl fluorenylene group, a di(C₁-C₁₀ alkyl)fluorenylene group, a C₆-C₁₄ aryl fluorenylene group, a di(C₆-C₁₄ aryl)fluorenylene group, a pyridylene group, a C₁-C₁₀ alkyl pyridylene group, a di(C₁-C₁₀ alkyl)pyridylene group, a carbazolylene group, a C₁-C₁₀ alkyl carbazolylene group, and a di(C₁-C₁₀ alkyl)carbazolylene group.
 4. A heterocyclic compound of claim 1, wherein Ar₁ through Ar₄ are each independently selected from the groups represented by Formulae 2A through 2G below:

wherein Z₁, Z₂, Z₁₁ and Z₁₂ are each independently selected from the group consisting of a hydrogen atom, a deuterium atom, a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, and a C₆-C₁₄ aryl group; p is an integer from 1 to 8; * denotes a binding site with Ar₁₁, Ar₁₂ or Ar₁₃; and *′ denotes a binding site with a ring of Formula
 1. 5. A heterocyclic compound of claim 1, wherein Ar₁₁, Ar₁₂ and Ar₁₃ are each independently selected from the group consisting of a substituted or unsubstituted C₅-C₂₀ aryl group and a substituted or unsubstituted C₄-C₂₀ heteroaryl group.
 6. A heterocyclic compound of claim 1, wherein Ar₁₁, Ar₁₂ and Ar₁₃ are each independently selected from the group consisting of a phenyl group, a C₁-C₁₀ alkyl phenyl group, a di(C₁-C₁₀ alkyl)phenyl group, a C₆-C₁₄ aryl phenyl group, a di(C₆-C₁₄ aryl)phenyl group, a naphthyl group, a C₁-C₁₀ alkyl naphthyl group, a di(C₁-C₁₀ alkyl)naphthyl group, a C₆-C₁₄ aryl naphthyl group, a di(C₆-C₁₄ aryl)naphthyl group, an anthryl group, a C₁-C₁₀ alkyl anthryl group, a di(C₁-C₁₀ alkyl)anthryl group, a C₆-C₁₄ aryl anthryl group, a di(C₆-C₁₄ aryl)anthryl group, a phenanthryl group, a C₁-C₁₀ alkyl phenanthryl group, a di(C₁-C₁₀ alkyl)phenanthryl group, a C₆-C₁₄ aryl phenanthryl group, a di(C₆-C₁₄ aryl)phenanthryl group, a fluorenyl group, a C₁-C₁₀ alkyl fluorenyl group, a di(C₁-C₁₀ alkyl)fluorenyl group, a C₆-C₁₄ aryl fluorenyl group, a di(C₆-C₁₄ aryl) fluorenyl group, a pyridyl group, a C₁-C₁₀ alkyl pyridyl group, a di(C₁-C₁₀ alkyl)pyridyl group, a pyrenyl group, a C₁-C₁₀ alkyl pyrenyl group, a di(C₁-C₁₀ alkyl)pyrenyl group, a C₆-C₁₄ aryl pyrenyl group, a di(C₆-C₁₄ aryl)pyrenyl group, a phenanthrolinyl group, a C₁-C₁₀ alkyl phenanthrolinyl group, a di(C₁-C₁₀ alkyl)phenanthrolinyl group, a C₆-C₁₄ aryl phenanthrolinyl group, a di(C₆-C₁₄ aryl)phenanthrolinyl group, a quinolinyl group, C₁-C₁₀ alkyl quinolinyl group, a di(C₁-C₁₀ alkyl)quinolinyl group, a C₆-C₁₄ aryl quinolinyl group, a di(C₆-C₁₄ aryl)quinolinyl group, a benzoxazolyl group, a C₁-C₁₀ alkyl benzoxazolyl group, a di(C₁-C₁₀ alkyl)benzoxazolyl group, a C₆-C₁₄ aryl benzoxazolyl group, a di(C₆-C₁₄ aryl)benzoxazolyl group, a benzothiazolyl group, a C₁-C₁₀ alkyl benzothiazolyl group, a di(C₁-C₁₀ alkyl)benzothiazolyl group, a C₆-C₁₄ aryl benzothiazolyl group, a di(C₆-C₁₄ aryl)benzothiazolyl group, a benzimidazolyl group, a C₁-C₁₀ alkyl benzimidazolyl group, a di(C₁-C₁₀ alkyl)benzimidazolyl group, a C₆-C₁₄ aryl benzimidazolyl group, a di(C₆-C₁₄ aryl)benzimidazolyl group, an imidazolpyridinyl group, a C₁-C₁₀ alkyl imidazolpyridinyl group, a di(C₁-C₁₀ alkyl)imidazolpyridinyl group, a C₆-C₁₄ aryl imidazolpyridinyl group, a di(C₆-C₁₄ aryl)imidazolpyridinyl group, an imidazolpyrimidinyl group, a C₁-C₁₀ alkyl imidazolpyrimidinyl group, a di(C₁-C₁₀ alkyl)imidazolpyrimidinyl group, a C₆-C₁₄ aryl imidazolpyrimidinyl group, a di(C₆-C₁₄ aryl)imidazolpyrimidinyl group, a carbazolyl group, a C₁-C₁₀ alkyl carbazolyl group, a di(C₁-C₁₀ alkyl)carbazolyl group, a C₆-C₁₄ aryl carbazolyl group, and a di(C₆-C₁₄ aryl)carbazolyl group.
 7. A heterocyclic compound of claim 1, wherein Ar₁₁, Ar₁₂, and Ar₁₃ are each independently selected from among the groups represented by Formulae 3A through 3P below:

wherein Z₁, Z₂, Z₃, Z₁₁ and Z₁₂ are each independently selected from the group consisting of a hydrogen atom, a deuterium atom, a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, and a C₆-C₁₄ aryl group; p is an integer from 1 to 8; and * denotes a binding site with Ar₁, Ar₂, Ar₃, or Ar₄.
 8. A heterocyclic compound of claim 1, wherein a, b, c and d are each independently 0, 1, 2 or
 3. 9. A heterocyclic compound of claim 1, wherein R₁ through R₁₄ are each independently selected from the group consisting of a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, an amino group, a nitro group, a hydroxyl group, a substituted or unsubstituted C₁-C₁₀ alkyl group, a group represented by —(Ar₁)_(a)—(Ar₁₁), and a group represented by —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)]; Ar₁ through Ar₄ are each independently selected from the group consisting of a substituted or unsubstituted C₅-C₂₀ arylene group and a substituted or unsubstituted C₄-C₂₀ heteroarylene group; Ar₁₁, Ar₁₂ and Ar₁₃ are each independently selected from the group consisting of a phenyl group, a C₁-C₁₀ alkyl phenyl group, a di(C₁-C₁₀ alkyl)phenyl group, a C₆-C₁₄ aryl phenyl group, a di(C₆-C₁₄ aryl)phenyl group, a naphthyl group, a C₁-C₁₀ alkyl naphthyl group, a di(C₁-C₁₀ alkyl)naphthyl group, a C₆-C₁₄ aryl naphthyl group, a di(C₆-C₁₄ aryl)naphthyl group, an anthryl group, a C₁-C₁₀ alkyl anthryl group, a di(C₁-C₁₀ alkyl)anthryl group, a C₆-C₁₄ aryl anthryl group, a di(C₆-C₁₄ aryl)anthryl group, a phenanthryl group, a C₁-C₁₀ alkyl phenanthryl group, a di(C₁-C₁₀ alkyl)phenanthryl group, a C₆-C₁₄ aryl phenanthryl group, a di(C₆-C₁₄ aryl)phenanthryl group, a fluorenyl group, a C₁-C₁₀ alkyl fluorenyl group, a di(C₁-C₁₀ alkyl)fluorenyl group, a C₆-C₁₄ aryl fluorenyl group, a di(C₆-C₁₄ aryl)fluorenyl group, a pyridyl group, a C₁-C₁₀ alkyl pyridyl group, a di(C₁-C₁₀ alkyl)pyridyl group, a pyrenyl group, a C₁-C₁₀ alkyl pyrenyl group, a di(C₁-C₁₀ alkyl)pyrenyl group, a C₆-C₁₄ aryl pyrenyl group, a di(C₆-C₁₄ aryl)pyrenyl group, a phenanthrolinyl group, a C₁-C₁₀ alkyl phenanthrolinyl group, a di(C₁-C₁₀ alkyl)phenanthrolinyl group, a C₆-C₁₄ aryl phenanthrolinyl group, a di(C₆-C₁₄ aryl)phenanthrolinyl group, a quinolinyl group, a C₁-C₁₀ alkyl quinolinyl group, a di(C₁-C₁₀ alkyl)quinolinyl group, a C₆-C₁₄ aryl quinolinyl group, a di(C₆-C₁₄ aryl)quinolinyl group, a benzoxazolyl group, a C₁-C₁₀ alkyl benzoxazolyl group, a di(C₁-C₁₀ alkyl)benzoxazolyl group, a C₆-C₁₄ aryl benzoxazolyl group, a di(C₆-C₁₄ aryl)benzoxazolyl group, a benzothiazolyl group, a C₁-C₁₀ alkyl benzothiazolyl group, a di(C₁-C₁₀ alkyl)benzothiazolyl group, a C₆-C₁₄ aryl benzothiazolyl group, a di(C₆-C₁₄ aryl)benzothiazolyl group, a benzimidazolyl group, a C₁-C₁₀ alkyl benzimidazolyl group, a di(C₁-C₁₀ alkyl)benzimidazolyl group, a C₆-C₁₄ aryl benzimidazolyl group, a di(C₆-C₁₄ aryl)benzimidazolyl group, an imidazolpyridinyl group, a C₁-C₁₀ alkyl imidazolpyridinyl group, a di(C₁-C₁₀ alkyl)imidazolpyridinyl group, a C₆-C₁₄ aryl imidazolpyridinyl group, a di(C₆-C₁₄ aryl)imidazolpyridinyl group, an imidazolpyrimidinyl group, a C₁-C₁₀ alkyl imidazolpyrimidinyl group, a di(C₁-C₁₀ alkyl)imidazolpyrimidinyl group, a C₆-C₁₄ aryl imidazolpyrimidinyl group, a di(C₆-C₁₄ aryl)imidazolpyrimidinyl group, a carbazolyl group, a C₁-C₁₀ alkyl carbazolyl group, a di(C₁-C₁₀ alkyl)carbazolyl group, a C₆-C₁₄ aryl carbazolyl group, and a di(C₆-C₁₄ aryl)carbazolyl group; and a, b, c and d are each independently 0, 1, 2 or
 3. 10. A heterocyclic compound of claim 1, wherein the heterocyclic compound is represented by Formula 2 below:

wherein, in Formula 2, R₁, R₂, R₃, R₈, R₉ and R₁₀ are each independently selected from the group consisting of a substituted or unsubstituted C₁-C₅₀ alkyl group, a substituted or unsubstituted C₂-C₅₀ alkenyl group, a substituted or unsubstituted C₂-C₅₀ alkynyl group, a substituted or unsubstituted C₃-C₅₀ cycloalkyl group, a substituted or unsubstituted C₁-C₅₀ alkoxy group, a group represented by —(Ar₁)_(a)—(Ar₁₁), and a group represented by —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)], wherein at least two adjacent groups of R₁, R₂, R₃, R₈, R₉ and R₁₀ are linked to form a saturated or unsaturated ring; wherein Ar₁ through Ar₄ are each independently selected from the group consisting of a substituted or unsubstituted C₅-C₂₀ arylene group and a substituted or unsubstituted C₄-C₂₀ heteroarylene group; Ar₁₁, Ar₁₂ and Ar₁₃ are each independently selected from the group consisting of a substituted or unsubstituted C₅-C₆₀ aryl group, a substituted or unsubstituted C₅-C₅₀ aryloxy group, a substituted or unsubstituted C₅-C₅₀ arylthio group, and a substituted or unsubstituted C₄-C₆₀ heteroaryl group; a, b, c and d are each independently an integer from 0 to 10; and —(Ar₁)_(a)— groups in —(Ar₁)_(a)—(Ar₁₁) are identical to or different from each other, —(Ar₂)_(b)— groups in —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)] are identical to or different from each other, —(Ar₃)_(c)— groups are identical to or different from each other, and —(Ar₄)_(d)— groups are identical to or different from each other.
 11. A heterocyclic compound of claim 10, wherein Ar₁ through Ar₄ are each independently selected from the group consisting of a phenylene group, a C₁-C₁₀ alkyl phenylene group, a di(C₁-C₁₀ alkyl)phenylene group, a naphthylene group, a C₁-C₁₀ alkyl naphthylene group, a di(C₁-C₁₀ alkyl)naphthylene group, an anthrylene group, a C₁-C₁₀ alkyl anthrylene group, a di(C₁-C₁₀ alkyl)anthrylene group, a fluorenylene group, a C₁-C₁₀ alkyl fluorenylene group, a di(C₁-C₁₀ alkyl)fluorenylene group, a C₆-C₁₄ aryl fluorenylene group, a di(C₆-C₁₄ aryl)fluorenylene group, a pyridylene group, a C₁-C₁₀ alkyl pyridylene group, a di(C₁-C₁₀ alkyl)pyridylene group, a carbazolylene group, a C₁-C₁₀ alkyl carbazolylene group, and a di(C₁-C₁₀ alkyl)carbazolylene group.
 12. A heterocyclic compound of claim 10, wherein Ar₁ through Ar₄ are each independently selected from the groups represented by Formulae 2A through 2G below:

wherein Z₁, Z₂, Z₁₁ and Z₁₂ are each independently selected from the group consisting of a hydrogen atom, a deuterium atom, a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, and a C₆-C₁₄ aryl group; p is an integer from 1 to 8; * denotes a binding site with Ar₁₁, Ar₁₂ or Ar₁₃; and *′ denotes a binding site with a ring of Formula
 1. 13. A heterocyclic compound of claim 10, wherein Ar₁₁, Ar₁₂ and Ar₁₃ are each independently selected from the group consisting of a substituted or unsubstituted C₅-C₂₀ aryl group and a substituted or unsubstituted C₄-C₂₀ heteroaryl group.
 14. A heterocyclic compound of claim 10, wherein Ar₁₁, Ar₁₂ and Ar₁₃ are each independently selected from the group consisting of a phenyl group, a C₁-C₁₀ alkyl phenyl group, a di(C₁-C₁₀ alkyl)phenyl group, a C₆-C₁₄ aryl phenyl group, a di(C₆-C₁₄ aryl)phenyl group, a naphthyl group, a C₁-C₁₀ alkyl naphthyl group, a di(C₁-C₁₀ alkyl)naphthyl group, a C₆-C₁₄ aryl naphthyl group, a di(C₆-C₁₄ aryl)naphthyl group, an anthryl group, a C₁-C₁₀ alkyl anthryl group, a di(C₁-C₁₀ alkyl)anthryl group, a C₆-C₁₄ aryl anthryl group, a di(C₆-C₁₄ aryl)anthryl group, a phenanthryl group, a C₁-C₁₀ alkyl phenanthryl group, a di(C₁-C₁₀ alkyl)phenanthryl group, a C₆-C₁₄ aryl phenanthryl group, a di(C₆-C₁₄ aryl)phenanthryl group, a fluorenyl group, a C₁-C₁₀ alkyl fluorenyl group, a di(C₁-C₁₀ alkyl)fluorenyl group, a C₆-C₁₄ aryl fluorenyl group, a di(C₆-C₁₄ aryl)fluorenyl group, a pyridyl group, a C₁-C₁₀ alkyl pyridyl group, a di(C₁-C₁₀ alkyl)pyridyl group, a pyrenyl group, a C₁-C₁₀ alkyl pyrenyl group, a di(C₁-C₁₀ alkyl)pyrenyl group, a C₆-C₁₄ aryl pyrenyl group, a di(C₆-C₁₄ aryl)pyrenyl group, a phenanthrolinyl group, a C₁-C₁₀ alkyl phenanthrolinyl group, a di(C₁-C₁₀ alkyl)phenanthrolinyl group, a C₆-C₁₄ aryl phenanthrolinyl group, a di(C₆-C₁₄ aryl)phenanthrolinyl group, a quinolinyl group, C₁-C₁₀ alkyl quinolinyl group, a di(C₁-C₁₀ alkyl)quinolinyl group, a C₆-C₁₄ aryl quinolinyl group, a di(C₆-C₁₄ aryl)quinolinyl group, a benzoxazolyl group, a C₁-C₁₀ alkyl benzoxazolyl group, a di(C₁-C₁₀ alkyl)benzoxazolyl group, a C₆-C₁₄ aryl benzoxazolyl group, a di(C₆-C₁₄ aryl)benzoxazolyl group, a benzothiazolyl group, a C₁-C₁₀ alkyl benzothiazolyl group, a di(C₁-C₁₀ alkyl)benzothiazolyl group, a C₆-C₁₄ aryl benzothiazolyl group, a di(C₆-C₁₄ aryl)benzothiazolyl group, a benzimidazolyl group, a C₁-C₁₀ alkyl benzimidazolyl group, a di(C₁-C₁₀ alkyl)benzimidazolyl group, a C₆-C₁₄ aryl benzimidazolyl group, a di(C₆-C₁₄ aryl)benzimidazolyl group, an imidazolpyridinyl group, a C₁-C₁₀ alkyl imidazolpyridinyl group, a di(C₁-C₁₀ alkyl)imidazolpyridinyl group, a C₆-C₁₄ aryl imidazolpyridinyl group, a di(C₆-C₁₄ aryl)imidazolpyridinyl group, an imidazolpyrimidinyl group, a C₁-C₁₀ alkyl imidazolpyrimidinyl group, a di(C₁-C₁₀ alkyl)imidazolpyrimidinyl group, a C₆-C₁₄ aryl imidazolpyrimidinyl group, a di(C₆-C₁₄ aryl)imidazolpyrimidinyl group, a carbazolyl group, a C₁-C₁₀ alkyl carbazolyl group, a di(C₁-C₁₀ alkyl)carbazolyl group, a C₆-C₁₄ aryl carbazolyl group, and a di(C₆-C₁₄ aryl)carbazolyl group.
 15. A heterocyclic compound of claim 10, wherein Ar₁₁, Ar₁₂, and Ar₁₃ are each independently selected from the groups represented by Formulae 3A through 3P below:

wherein Z₁, Z₂, Z₃, Z₁₁ and Z₁₂ are each independently selected from the group consisting of a hydrogen atom, a deuterium atom, a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, and a C₆-C₁₄ aryl group; p is an integer from 1 to 8; and * denotes a binding site with Ar₁, Ar₂, Ar₃, or Ar₄.
 16. A heterocyclic compound of claim 10, wherein a, b, c and d are each independently 0, 1, 2 or
 3. 17. A heterocyclic compound of claim 10, wherein R₁ and R₈ are each independently selected from the group consisting of a group represented by —(Ar₁)_(a)—(Ar₁₁) and a group represented by —(Ar₂)_(b)—N[—(Ar₃)_(c)—(Ar₁₂)][—(Ar₄)_(d)—(Ar₁₃)]; and R₂, R₃, R₉ are R₁₀ are each independently selected from the group consisting of a methyl group and a phenyl group; Ar₁ through Ar₄ are each independently selected from the group consisting of a substituted or unsubstituted C₅-C₂₀ arylene group and a substituted or unsubstituted C₄-C₂₀ heteroarylene group; Ar₁₁, Ar₁₂ and Ar₁₃ are each independently selected from the group consisting of a phenyl group, a C₁-C₁₀ alkyl phenyl group, a di(C₁-C₁₀ alkyl)phenyl group, a C₆-C₁₄ aryl phenyl group, a di(C₆-C₁₄ aryl)phenyl group, a naphthyl group, a C₁-C₁₀ alkyl naphthyl group, a di(C₁-C₁₀ alkyl)naphthyl group, a C₆-C₁₄ aryl naphthyl group, a di(C₆-C₁₄ aryl)naphthyl group, an anthryl group, a C₁-C₁₀ alkyl anthryl group, a di(C₁-C₁₀ alkyl)anthryl group, a C₆-C₁₄ aryl anthryl group, a di(C₆-C₁₄ aryl)anthryl group, a phenanthryl group, a C₁-C₁₀ alkyl phenanthryl group, a di(C₁-C₁₀ alkyl)phenanthryl group, a C₆-C₁₄ aryl phenanthryl group, a di(C₆-C₁₄ aryl)phenanthryl group, a fluorenyl group, a C₁-C₁₀ alkyl fluorenyl group, a di(C₁-C₁₀ alkyl)fluorenyl group, a C₆-C₁₄ aryl fluorenyl group, a di(C₆-C₁₄ aryl)fluorenyl group, a pyridyl group, a C₁-C₁₀ alkyl pyridyl group, a di(C₁-C₁₀ alkyl)pyridyl group, a pyrenyl group, a C₁-C₁₀ alkyl pyrenyl group, a di(C₁-C₁₀ alkyl)pyrenyl group, a C₆-C₁₄ aryl pyrenyl group, a di(C₆-C₁₄ aryl)pyrenyl group, a phenanthrolinyl group, a C₁-C₁₀ alkyl phenanthrolinyl group, a di(C₁-C₁₀ alkyl)phenanthrolinyl group, a C₆-C₁₄ aryl phenanthrolinyl group, a di(C₆-C₁₄ aryl)phenanthrolinyl group, a quinolinyl group, a C₁-C₁₀ alkyl quinolinyl group, a di(C₁-C₁₀ alkyl)quinolinyl group, a C₆-C₁₄ aryl quinolinyl group, a di(C₆-C₁₄ aryl)quinolinyl group, a benzoxazolyl group, a C₁-C₁₀ alkyl benzoxazolyl group, a di(C₁-C₁₀ alkyl)benzoxazolyl group, a C₆-C₁₄ aryl benzoxazolyl group, a di(C₆-C₁₄ aryl)benzoxazolyl group, a benzothiazolyl group, a C₁-C₁₀ alkyl benzothiazolyl group, a di(C₁-C₁₀ alkyl)benzothiazolyl group, a C₆-C₁₄ aryl benzothiazolyl group, a di(C₆-C₁₄ aryl)benzothiazolyl group, a benzimidazolyl group, a C₁-C₁₀ alkyl benzimidazolyl group, a di(C₁-C₁₀ alkyl)benzimidazolyl group, a C₆-C₁₄ aryl benzimidazolyl group, a di(C₆-C₁₄ aryl)benzimidazolyl group, an imidazolpyridinyl group, a C₁-C₁₀ alkyl imidazolpyridinyl group, a di(C₁-C₁₀ alkyl)imidazolpyridinyl group, a C₆-C₁₄ aryl imidazolpyridinyl group, a di(C₆-C₁₄ aryl)imidazolpyridinyl group, an imidazolpyrimidinyl group, a C₁-C₁₀ alkyl imidazolpyrimidinyl group, a di(C₁-C₁₀ alkyl)imidazolpyrimidinyl group, a C₆-C₁₄ aryl imidazolpyrimidinyl group, a di(C₆-C₁₄ aryl)imidazolpyrimidinyl group, a carbazolyl group, a C₁-C₁₀ alkyl carbazolyl group, a di(C₁-C₁₀ alkyl)carbazolyl group, a C₆-C₁₄ aryl carbazolyl group, and a di(C₆-C₁₄ aryl)carbazolyl group; and a, b, c and d are each independently 0, 1, 2 or
 3. 18. An organic light-emitting device comprising: a first electrode; a second electrode disposed opposite to the first electrode; and an organic layer disposed between the first electrode and the second electrode, the organic layer comprising a heterocyclic compound of claim
 1. 19. The organic light-emitting device of claim 18, wherein the organic layer is selected from the group consisting of an electron injection layer, an electron transport layer, and an emission layer. 